Knock-off mechanism for looms



s. C. JOHNSTON.

- KNOCK-OFF MECHANISM FOR LOOMS.

APPLICATION FILED MAR 8. I920.

1,353,343. a Patentedsgpt. 21,1920.

UNITED @F R SAMUEL CLAUDE JOHNSTON, or LANCASTER, so'UrH c RoLr A,

kNooK-orr MECHANISM FOR LOOMS.

T all whom it may concern;

Be it known that I, SAMUEL CLAUDE JoHN's'roN a citizen of the United States, residing at Lancasterfln the county of Danoa ster and State of SouthCar'olina, have invented certain new and useful Improvev ments in Knock-Off 'Mechanism for Looms,

of which the following is a specification,

reference being" had to the accompanying drawings.

This invention relates to looms, 'and'p' ar-' ticularly to stopping orknock-ofi' mechanism for looms. I

v The general ob1ect' of the invention is to obviate the difliculty now experienced with looms whenthe woven cloth starts to wrap on the sand roller or take-up roller, which is liable'to breakthejintermediate gear ,tion is to provide means for automatically bracket and change gearbracket; p 7 v More specifically, the ob'ect of the invenoperating the knock-offer shipper lever of the loom when thereis too much friction on thesandroller or take-up roller caused by the wrapping of the cloth on the sand roller;

And'a further object is to provide a very simple mechanism to this end which may be readily applied to any ordinary loom, but which is particularly adapted for a Draper loom;

ber whichdrivesthe sand or take-up roller,

which is shiftable under undue strain, and

'which,'when shifted, will act to shift the shipper" lever and cause the loom to knock off.

H A further object is to provide a deviceof this character which includesa worm slidably mounted upon a drive shaft and en "gaging a worm wheel, which worm wheel'is engaged through intermediate gearing-with the sand or take-up roller, the worm being held in engagement with the worm ;wheel by means of "aspring and provide" in con 'eratively connected to the stop motion arm ofusual' character, which is in turn connected to the shipper lever sothatwhen the cloth starts to wrap on the take-up roller, it exerts such frictionson' the take-up roller as; to stop it or retard it. "This stoppage causesv the worm to shift along the shaft against the action of the spring and thus shift said lever, which in turn" operates the arm to shiftthe shipper lever to aip'osition Specification of Letters Patent A further object is to provide-the mem Patented Sept 1920.

loom to knock off. 4

I Otherobjects will appear theicourse of the following descriptionk" My invention is illustrated-in e'accompanyingdrawlngsgwhere nz Figure 1 is a rear elevation ofonele nd of a loorn having-'my improvedrtake up roller actuating mechanism applied thereto;

Fig. '2 is a front fragmentaryfelevationof thewormthereon in section;"

Fig. 4 is a perspectiveview of the sleeve suproun5ding theworm'carrying shaft) 1g; therefor; I t

Fig. 6 is a'fragmentary perspectiveiview ofthearm35.

'a loom showing my take-up'actuating or knock-off mechanism applied thereto; N l

' Flg. 31s a View of the worm shaft IOwith V is a perspective view of thef-lever .75, V V

. lnthesedrawingsfl haveillustrated such portions of a Draper loom as are'allied with T;

my stopping mechanism. It willbe' understood that the drawings are purely "illustrative and are only sufficient to indicate the position and operationof 'my improved I -hav e*illustrated in these drawings a continuoustak'e-up motion, but

mechanism.

I do not wish to be limited to this, as my in- 'vention equally well applies to an intermittent take-up motion In these drawings zontallydisposed shaftatthe side of the loom which carries at one end the beveled gear wheel llnlounted in suitable bearings 10 designates; a heir 12. This; beveled gear'wheel meshes with a driving beveled gear wheel 13. 'The other? extremity of this. shaft 10 is reduced in diameter, and carries upon it a sli'dably' 'r'nount'edworm gear 14s. This worm gear, meshes with-a worm gear wheel 15" mountedin suitable bearings 16 and having at one "extremitythe gearwheelil7 shown as meshing with a 'relativelyflarge' gear wheel 18' {which carries a' pinion 19'meshing with-a3 v relatively small gear; wheel 20 carrying a "small pinion 21,7in' turn meshing with .a relatively large gear "wheelf22, which" in turn meshes with-or is operatively engaged.

with a pinion 23 carried by the shaft of'the sand roller or take-up roller 24. It will be understood, of course,'that the cloth roller is intended to be operatively driven'fror'n oneof thesegear wheels; The numberfof these intermediate gear wheels is immatef r v rial to my inventionjand my invention is not connected in any way with the manner 7 reduced portion of the shaft 10. I

f' It will now be obvious that tmwom may be shiftedtoward the left in Fig. 1,

inwhich the cloth roller is driven .or .the manner in which the sand roller or take-up roller is driven. i

As before remarked, the worm 14 is slidably mounted upon the shaft 10, nd one end bears against a cap nut 25. Bearing against the other end of the Worm' 14 is a sleeve 26 having parallel, annular flanges to define an annular recess receiving a ring 27"l1kea shipper ring, this ring having the rearwardly projecting stud 28. Bearing against the. end of the sleeve 26 opposite the worm 14 is a spring 29,;which in turn bears against a collar30-fastened bya set screw '31 to the thus shifting the sleeve 26'against the action of spring 29, and that when-lthe-pres sure is released,the spring 29 will cause the parts to return to theirjnormal positions.

.Pivoted to any suitable portion ofthe frame is a lever32 whose upper endis perforated for the passage of the stud'23. The lower end of this lever has pivoted to'it a a, slotted link Mounted upon a gshaft 34 is the usual arm 35. This shaft 34 is con nectedto the ordinary stop motion mechanismof the loom. The upper end of this arm 35 is formed with a horizontally disposedloop or yoke 36 which engages over the lower end of the usual shipper lever 37,

which is operatively connected to the belt shifting means in the usual'manner. A pin 38 extends from the arm 35 into the slot of the link 33. The slotted link 33 permits the arm 35 to be operated in one direction to knock off the loom withoutaffecting the lever 32,.but when this lever 32 Yis operated,

. by a shiftingof the worm, as-will be described, it will shift 'thisfarm 33 to cause the yoke 36; to operate on: the shipper lever 37 to thereby knock off theloom.

of thecloth wrapping around the. latter, the

,friction-on thelsand roller will impede its {movement so that the gear 15 will not r0- tate as fastas the worm, and as a consequencethe resistance will cause theworm to l shift on the shaft 10 in the direction of the 1 Jarrow, ,Fig. 1, against the action of' the spring 2 9. Thi'smovement of the worm will cause the lever 32to shift the stop motion arm 35 in' a direction to shift the shipper a fleverout of its holding notch and'cause the loom to stop. 1

' It is to be understood that inthe drawings above referred to, .l have not attempted to illustrate.allthemechanism of the Draper loom, but have simply shown those parts with which my attachment is intimately conheated. \Vhile l 'have heretofore referred to and illustrated a continuous take-up motion,

In the operation of this mechanism, when .the sand roller stops or hangs upby reason antenna.

I do not wish to be limited to this, as it is obvious that a step by step take-up motion may also be used. 7

I claim V 1. In a loom, a take-up roller, mechanism for driving the take-up roller including a driven member operatively connected thereto and a driving member operatively en gaged'with the driven memben said drivingmember being'yieldable one direction when the motion o'f the driven member is impeded, a leveroperatively connected to the driving member and shiftable therewith,

a knock-off armuhaving a yoke, a'shipper lever passing through said'yoke and operated thereby, a'lever 'operatively connected iatoneend to the driving member andshiftable therewith, the opposite end of the lever having a link operatively connected to said knock-off arm.

" 2. In a loom, a take up'roller, mechanisml for driving the take-up roller including a worm gear wheel'operatively connected to the take-up roller, and a driving shaft, a worm sliding'ly mounted upon the driving shaft and engaging said .worm gearfwheel,

a spring normally holding saidv worm from longitudinal movement on the drivingshaft and holding it in engagement with the; worm gear wheel, a knock-off mechanism, and

gmejans operatively connecting the worm with sald knock-off mechanlsm to cause an foperation of'the knock-off mechanismfwhen the worm slides on the shaft against the ac-" tion of said' spring under theresistance offered by the wormgear wheel. J y

,. 3. In a loom, a take up roller; mechanism for driving thetake-up roller including a worm gear wheel o-peratively connected to thetake-up roller, and a driving shaft, a worm slidingly mounted upon; the vdrivling shaft and engaging said worm gear wheel,a springnormally holdingsaid worm y from longitudlnal movement on the driving shaft and holding it in engagement with the worm gear wheel, a knock-off arm having a yoke, a shipper lever passing through the-yoke, and means operativelyconnecting when the worm gear wheel;resists rotation,

.a sleeve bearing againsttheiwforima spring bearing against the-sleeveand surrounding i the shaft,.,a lever; pivoted intermediateit's ,endsand at its upper. end having rotative L gagement with the sleeve,f a knqckgefijann having a yoke, a shipper 1eve1-passifi through the yoke, and a slotted link pivotally connected to the lower end of the le-- ments meshing with each other, the driving gear element being yieldably held in operative engagement with the driven gear element but being shiftable out of operative position upon resistance being ofiered by the driven gear element, and means operatively connecting the driving element to the knockoff mechanism of the loom and actuating the knock-01f mechanism when the driving element is shifted by resistance to its movement ofl'ered by the driven element.

6. In a mechanism of the .character described, a driving shaft having thereon a '20 worm slidably mounted on the driving shaft, ,7 a worm wheel with which the worm engages,

aspring urging the worm into a position where it is engaged with the worm wheel,

said mechanism permitting the worm to au- 25 v tomatically shift out of operative engagement with the worm wheel upon resistance being offered to the movement of the worm wheel, and controlling means shifted into operative position by the shifting of said 30 worm out of operative engagement with the worm wheel.

In testimony whereof I hereunto aflixmy I signature.

. SAMUEL-CLAUDE JOHNSTON-'7 

